Note 1 - Company Overview (Details Textual) $ in Thousands		3 Months Ended		9 Months Ended
	May 14, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Aug. 29, 2025 USD ($)	Dec. 31, 2024 USD ($)
Net Income (Loss) Attributable to Parent		$ (2,281)	$ (1,773)	$ (11,037)	$ (10,564)
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation				(9,853)	2,174
Cash and Cash Equivalent		7,588	$ 16,071	7,588	$ 16,071
Retained Earnings (Accumulated Deficit)		(722,714)		(722,714)			$ (711,677)
Minimum [Member]
Restructuring and Related Cost, Annualized Savings Generated	$ 5,000
Maximum [Member]
Restructuring and Related Cost, Annualized Savings Generated	$ 6,000
Sales and Distribution Expenses [Member]
Restructuring Charges				1,000
General and Administrative Expense [Member]
Restructuring Charges				800
Employee Severance [Member]
Restructuring and Related Cost, Number of Positions Eliminated	20
Restructuring Charges		1,800		$ 1,844
Employee Severance [Member] | Sales and Distribution Expenses [Member]
Restructuring Charges		1,000
Employee Severance [Member] | General and Administrative Expense [Member]
Restructuring Charges		$ 800
Line of Credit [Member] | Midcap Credit Facility [Member]
Line of Credit Facility, Temporary Minimum Liquidity						$ 5,000
Line of Credit Facility, Temporary Minimum Liquidity After Delivery of Liquidity Certificate						6,800
Line of Credit Facility, Availability Reserve						2,800
Line of Credit Facility, Availability Reserve after Reduction Period						$ 1,000